Windows程序设计作业1：

一. 题目：

      信用卡还款是银行系统的重要业务，业务流程说明如下：

1. 用户有信用卡和储蓄卡，储蓄卡有查询余额和取款功能，信用卡能够查看账单金额、查看还款日和查看余额三个功能；
2. 请使用委托与事件实现下列功能：用户可自由设置信用卡还款关联的储蓄卡，当还款日到期时进行账单金额的自动划扣；
3. 请注意事件主要是设计什么时候启动委托，委托的主要目的是设置还款的储蓄卡

        为避免设计出现偏差，给出了部分功能代码，请在此基础上进行开发。

二.代码

1.定义委托与事件

class CreditCardDelegate
    {
        public int billamount;
        public int repaymentday;
        //请在此处添加自己的代码
        //定义委托
        public delegate void cxk(int billamout, int repaymentday);
        //定义事件
        public event cxk Mycxk;
        public void shiyon()
        {
            Console.WriteLine("今天是本月的{0}号。", DateTime.Today.Day);
            if (repaymentday == DateTime.Today.Day)
            {
                Mycxk(billamount, repaymentday);
                Console.WriteLine("还款完成");

            }
            else
            {

                Console.WriteLine("不用还款");
            }


        }

    }

2.主函数

 class Program
    {
        static void Main(string[] args)
        {
            DepositCard depositCard = new DepositCard();
            depositCard.amount = 10000;
            CreditCard creditCard1 = new CreditCard(-2000, 9);
            CreditCard creditCard2 = new CreditCard(-3000, 13);
            CreditCard creditCard3 = new CreditCard(-5000, 29);
            depositCard.Display(); Console.WriteLine("");
            List<CreditCard> Cards = new List<CreditCard>();
            Cards.Add(creditCard1); Cards.Add(creditCard2); Cards.Add(creditCard3);

            foreach (CreditCard card in Cards)
            {
                Console.WriteLine("信用卡开始执行委托还款。。。。。。");
                //请在此处添加自己的代码
                CreditCardDelegate a = new CreditCardDelegate();
                a.repaymentday = card.getrepaymentday();
                a.billamount = card.getbillamount();
                a.Mycxk += new CreditCardDelegate.cxk(depositCard.Account);
                a.shiyon();
                depositCard.Display();
                Console.WriteLine("");
            }

            Console.ReadLine();
        }
    }
}

3.全部代码

using System.Security.Cryptography.X509Certificates;

namespace ConsoleApplication3delegate
{
    class DepositCard
    {
        public int amount;

        public void Display()
        {
            Console.WriteLine("储蓄卡余额为：{0}", amount);
        }
        public void Account(int balance, int payday)
        {
            amount += balance;
            Console.WriteLine("今天是本月的｛0｝，取款｛1｝，储蓄卡余额为：{2}。", DateTime.Today.Day, balance, amount);
        }
    }

    class CreditCard
    {
        private int billamount;
        private int repaymentday;

        public CreditCard(int billamount, int repaymentday)
        {
            this.billamount = billamount;
            this.repaymentday = repaymentday;
        }

        public int getbillamount() { return billamount; }

        public int getrepaymentday() { return repaymentday; }

        public void Display() { Console.WriteLine("信用卡余额为：{0}", billamount); }


    }

    class CreditCardDelegate
    {
        public int billamount;
        public int repaymentday;
        //请在此处添加自己的代码
        //定义委托
        public delegate void cxk(int billamout, int repaymentday);
        //定义事件
        public event cxk Mycxk;
        public void shiyon()
        {
            Console.WriteLine("今天是本月的{0}号。", DateTime.Today.Day);
            if (repaymentday == DateTime.Today.Day)
            {
                Mycxk(billamount, repaymentday);
                Console.WriteLine("还款完成");

            }
            else
            {

                Console.WriteLine("不用还款");
            }


        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            DepositCard depositCard = new DepositCard();
            depositCard.amount = 10000;
            CreditCard creditCard1 = new CreditCard(-2000, 9);
            CreditCard creditCard2 = new CreditCard(-3000, 13);
            CreditCard creditCard3 = new CreditCard(-5000, 29);
            depositCard.Display(); Console.WriteLine("");
            List<CreditCard> Cards = new List<CreditCard>();
            Cards.Add(creditCard1); Cards.Add(creditCard2); Cards.Add(creditCard3);

            foreach (CreditCard card in Cards)
            {
                Console.WriteLine("信用卡开始执行委托还款。。。。。。");
                //请在此处添加自己的代码
                CreditCardDelegate a = new CreditCardDelegate();
                a.repaymentday = card.getrepaymentday();
                a.billamount = card.getbillamount();
                a.Mycxk += new CreditCardDelegate.cxk(depositCard.Account);
                a.shiyon();
                depositCard.Display();
                Console.WriteLine("");
            }

            Console.ReadLine();
        }
    }
}

三.结果截图

 四.总结

  通过这次实验，我了解委托和事件的用法，对c#的语法有了进一步理解。

五.源码地址：

 https://gitee.com/luo-puwen/windows-experiment-1/blob/master/%E5%AE%9E%E9%AA%8C